<tree-root
  #tree
  [nodes]="nodes"
  [options]="options"
  [focused]="true"
>
</tree-root>
<br>
<b>Custom Keys:</b><br>
enter - show alert<br>
<br>
<b>Custom Mouse Actions:</b><br>
shift+click - select multi<br>
double click - expand / collapse<br>
right-click - show alert
